Die-punch and process of and means for making same



(No Model.) I r H. S. SGHAADT. DIE PUNCH AND" PROCESS-0F AND MEANS FORMAKING SAME. N0. 531,600;

Patented Dec. 25,1894.

UNITED STATES PATENT O FIC HENRY s. SOHAADT, OF ST. Louis, MISSOURI,AssIeNoR To THE BRADLEY STENCIL MACHINE COMPANY, or MISSOURI.

DIE-PUNCH AND PROCESSOF AND MEANS FOR MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 531,600, dated December25, 1894. v Application filed October 13, 1894. Serial No. 525,839. (Nomodel.)

To all whom it may concern.-

Be it known that I, HENRY S. SOHAADT, a citizen of the United States,residing in the city of St. Louis, State of Missouri, have invented acertain new and useful Die-Punch and a Process of and Apparatus forMaking the Same, of which the following is a complete specification.

My invention relatesto die punches and also to a process of andapparatus for makingpunches. of labor and material and it consists inthe process and in the articles hereinafter described and claimed.

In the accompanying drawings which form part of this specification,Figure l is an elevation of. acasting or rough blank from which thepunch is made. Fig. 2 is a cross section of the skinning die with thepunch blank or casting in the process of being skinned. Figs. 3 and atare respectively face views of v the punch blank or casting before andafter ithas been skinned and dressed; and Fig. 5 is a plan of theskinning die.

In carrying out my process, the metal blank,

preferablyof steel, is cast, forged or other-' wise formed as nearly aspracticable of the shape and size of the punch-to be made. This castingor blank 1, includes the cutting or punching portion or portions proper,2, and the base portion, 3, on which the punching portion is mountedintegral therewith. The

shank or stem, 4, is preferably integral with able manner.

the outer face of said casting or form smaller.

than the face of the finished punch. The

portion, 2, to be finished 0E is then inserted into adie, 5, of theexact size and shape which the finished punch is intended to have. Asthe outer face of the portion, 2, is smaller than this die, 5, theportion to be finished ofi is well centered in the die, 5, before any ofthe material is removed. This die, 5, is made in any suitable way, beingthe exact counter- Its principal object is economy part of the punchtobe made. Instead, however, of having a flat upper face, as in theordinary die, it is preferable to have its upper face raised or inclinedto the edges of the die opening, as shown in an exaggerate degree at 6,in Figs. 2 and 5, thus forming a sharper angle at such edges than in theordinary dies. For this purpose, where the upper face of the die ismainly flat, the portion immediately around the die opening is raisedabove the general level of the upper face of the die, being inclinedupwardly therefrom to make an acute angle with that side face of the dieopening which it meets at .the edge of the opening, whether such sideface is perpendicular or inclined to the general level of the upperface. Theportion, 2, to be finished ofi being thus centered in the die,5, is pressed or forced by any suitable means, such as a power press,into said die, 5, as far as is neces sary for the purpose hereinafterexplained. The narrower outer part of the portion, 2, to be finishedeasily enters the die, but when this portion has entered so far that itssides bear against the edges of the die, 5, the further inward movementbrings the sides of the portion, 2, against the sharp edges of the die,5.

These sharp edgesactas planers or trimmers to plane off or skin thesides of the portion, 2, in straight parallel lines. The shavings thuscut bear against the inclined portions of the die face whereby theyareturnedor curved back, as shown at 7, in Fig. 2, and break off or areremoved by any suitable means, as, for instance, bya file. The portion,2, thus trimmed or skinned is then finished by grinding or cutting offall of its tapering outer portion, which served for centering it in thedie, 5, down to a plane where all sides of the portion, 2, have beenplaned off or skinned by the edges of the die 5, such a plane beingindicated by dotted lines in Fig. 1. The portion, 2, is thus the exactcounter: part of the die, 5, and therefore is of the size' and shapedesired. Its depth, that is, the distance it extends beyond the base, 3,is determined as in an ordinary die and the punch is skinned almost, ifnot quite, to its base.

The punch may be finished on in any desired style, such as a shear edgeby making its face slightly inclined to its line of motion,

or such as hollow face punch. which this punch is intended toco-operate, may be made by any suitable process, being of the size andshape of the die, 5, except as to the raised edges of the opening.

In cutting stencils, many letters and characters require stays or smallportions left in the stencil blank to connect the portion forming theinner contour of the character integrally with the outer portion.Punches for such characters provide for the stays by open spaces, asshown at 8, thus practically separating the punch into two parts orportions; and the skinning die therefor also has two openings to matchsuch portions. The portion of the face of the die near these openings israised or inclined to the edges ofthe openings, as shown in Fig. 2. Sofar as the operation of skinning is concerned, each portion of the blankand its corresponding die opening coact as a separate casting or blank;but where the shavings of the two portions interfere, it becomesnecessary to remove the shavings before completing the stroke and tobegin the operation of skinning again where it was left oif.

The principal advantages of this process are its quickness and economyand the practically absolute interchangeability of all punches made fromthe same die.

What I claim as new, and desire to secure by Letters Patent, is

1. The process of making punches, which consists in forming a metallicblank of approximately the shape of the punch to be made but slightlylarger than such punch, and forcing said blank into a die of the sizeand shape of the punch to be made, substantially as and for the purposespecified.

2. The process of making punches, which consists in forming a metallicblank consisting of a base and a projecting portion of the shape of butslightly larger than the punch to be made, the sides of the outer partof said projecting portion tapering so as to make the The die, withouter face thereof narrower than the punch to be made, and forcing saidprojecting portion of said blank into a die which is the counterpart ofthe punch to be made, and cutting off the narrower outer part of saidprojecting portion, substantially as and for the purpose described.

3. The process of making punches, which consists in forming a metallicblank of approximately the shape of the punch to be made, but slightlylarger than such punch, and forcing said blank into a die of the exactsize and shape of the punch to be made and whose face inclines upwardlyto the edges of its opening, all substantially as and for the purposedescribed.

4. The process of making punches which consists in casting a metallicblank of approximately the shape bnt slightly larger than the punch tobe made, and forcing said blank into a die which is the counterpart ofthe punch to be made, substantially as and for the purpose described.

5. A punch blank consisting of a base portion and a projecting portionof the shape but slightly larger than the punch to be made, the sides ofsaid projecting portion tapering so that the outer face of saidprojecting portion is smaller than the punch to be made, substantiallyas and for the purpose specified.

6. A die having the portion immediately around the die opening raisedabove the general level of the upper face of the die, said raisedportion being inclined upwardly from such general level to make an acuteangle with the side face of the die opening, substantially as and forthe purpose set forth.

7. .A die having its upper face inclined upwardly to the edges of itsopening, substan tially as and for the purpose'set forth.

Signed this 10th day of October, 189d.

HENRY S. SCI'IAADT.

In presence ot' JAMES A. CARR, A. J. BRADLEY.

